The default installation gives your room for 1 product picture (1 Thumbnail, and 1 Large Image). The cart allows for up to 3 product pictures. To give yourself room for 2 or 3 product pictures, follow these steps:
- In your Store Admin, click "Catalog Setup"
- In the left column under "Item Images", choose your desired number of images.
- Click "Update Variables"
When you return to add/edit a product, you should see more fields for thumnail images and large images.
If you need more than 3 product pictures, you can always insert additional images into the description area.